Hi all,
We have run into a problem starting a service on EL7.1.
We installed the same environment on two hosts, on the first one the service
started successfully and on the second one it failed to start.
On the machine failing when running:
systemctl start supervdsmd.service
we see that a child process `systemd-tty-ask-password-agent --watch`
is spawned by systemctl:
[root@green-vdsc ~]# pstree -p $$
bash(13179)─┬─pstree(13494)
└─systemctl(13440)───systemd-tty-ask(13441)
using strace -f we see that systemctl is waiting on a response from
systemd-tty-ask but never receives it and gets stuck forever polling:
[pid 14884] execve("/usr/bin/systemd-tty-ask-password-agent",
["/usr/bin/systemd-tty-ask-passwor"..., "--watch"], [/* 31 vars */]) = 0
.
.
.
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\242\233\270\f9\257\326\257_\n\30\264\263\17\32\272\0058\331\245\236f\207\202\321(\322`pS\324\376"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"G\262_$\210%*\275Q`G\240\361F\323\306\254.\334\323]\314:!u\343H\200\227\1\206&"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\272\177J\330D\252\367\2\367w\302\230-\221'\267\365\376\214\217\334\327\245a\311\377\tfc\177\273j"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\324\230x\231\222\210\271-\22a\2134\202\274\\\373\305\231;\177\244e\246=k\204\216\327\340iG\17"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"3\210\234X\0N\202G\354\22WFt^\331V\344\32\\A\36\323[\302\370\363\371\210\211\t\2129"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"+\235\26\274\373R\34\377Rs9\370\273\370\t),V\276\v`\233^E\256\257lX#\27\23W"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\346\237\ru5\311\372\362K?2\203\300\246C2K(\4+\20\341t\4S\370\35\25}>\265\240"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"F\25\257j\233q\315W\25\334\306\233\217!\306$\255Y\33\364\0039Qy\2\223@o\235\257hw"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\324\316\10k*\332A\253\344^\5y\372\10I\375\216\372\271\277\205\2264\0\35>?]`\263\374\275"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\34P\10w\314e\270\226X\t\212\30\"\17.\334\3471\342B\334\272\315\351\367\324k\273S\363\323f"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"\210\230;\227\31\261\364A\301#\374\311\206?\17\202\2749\340\246\323gm\315\325\361\335K\200\6h\275"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
read(3,
"i\10Dl\5\312\222\376\10l\37\277X\341CIs\\\"\235{\315|\334\227\10>\246a\5,\36"...,
120) = 120
poll([{fd=3, events=POLLIN}], 1, 100) = 1 ([{fd=3, revents=POLLIN}])
systemctl is waiting for a response from its child process forever and does not
close it.
As a result, it never even tries to run the start command for our service
supervdsm.
So it looks like an issue either with systemd or the way our service interacts
with systemd.
Is anyone familiar with such an issue or has an idea why it happens and how to
fix it?
We still have the machine with this problem running if it helps,
can anybody maybe take a look and help figure out what's the problem?
Thanks,
Yeela.
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